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The Anna's Hummingbird is best monitored in Canada by the Christmas Bird Count (CBC). The species was first reported in British Columbia in the late 1940s and the first breeding event was discovered in 1958 (Campbell et al. 1990). Numbers remained very low until the 1970s, when the species became more widespread on the south coast (Campbell et al. 1990). CBC results from within Canada suggest a large increase in population since 1970 though the precision of these results is poor. Breeding Bird Survey (BBS) data from Canada are too sparse to calculate trends, but the range-wide data from both the BBS and CBC indicate a large increase in the continental population. Methods for CBCs are less standardized than the BBS and targeted efforts to record birds at feeders have increased over time; despite these biases, the magnitude of the increase is large enough to reliably conclude that Anna's Hummingbird have increased in Canada.
Additional information on: Christmas Bird Count (CBC)
Additional information on: Breeding Bird Survey in North America (BBS) - U.S. analyses
